Petrographical Analysis of Warthian Fuvioglacial Gravels as a Tool to Trace the Source Area – A Case Study From Central Poland

The petrographical features of the medium- and coarse-grained gravels (4-10 mm and 20-60 mm, respectively) of weathered and fresh (unweathered) deposits indicate, in combination with so-called indicator and statistical erratics, that two glacial lobes joined in the borderland of the Polish Lowlands...

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Bibliographic Details
Published in:Geologos
Main Authors: Górska-Zabielska Maria, Wachecka-Kotkowska Lucyna
Format: Article in Journal/Newspaper
Language:English
Published: Sciendo 2014
Subjects:
gravel petrography
indicator erratics
fuvioglacial deposits
Warthian stadial
central Poland
Geology
QE1-996.5
Ice Sheet
Online Access:https://doi.org/10.2478/logos-2014-0014
https://doaj.org/article/dd3a1dca96c74256bad7fad80ac836a7
Description
Summary:The petrographical features of the medium- and coarse-grained gravels (4-10 mm and 20-60 mm, respectively) of weathered and fresh (unweathered) deposits indicate, in combination with so-called indicator and statistical erratics, that two glacial lobes joined in the borderland of the Polish Lowlands and Uplands. Lower Palaeozoic limestones become less frequent in the fner gravel fraction, whereas crystalline rocks and fints become more frequent. The petrographical analysis of the coarser gravel fraction indicates that the ice sheet advanced from the NE to NNW (the Widawka lobe) and from the NE to ENE (the Rawka, Pilica and Luciąża lobes). The source areas of the gravel deposited by the Warthian ice sheet were magmatic and sedimentary areas of both the Baltic and the SE Sweden basins.

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